Siemens SENTRON 3VL1250 - Capacitor banks; Selection of the molded case circuit breaker for protecting and switching capacitors

Technical data
11.6 Capacitor banks
3VL IEC molded case circuit breakers
152 System Manual, 11/2013, 110 0110 - 02 DS 03
Molded case non-automatic circuit breakers
The table below shows the
power loss and the current path resistance for molded case non-
automatic circuit breakers
. The power loss applies for I
n
with 3-phase balanced load. The
specified power loss is the sum of all current paths. The current path resistance is only a
guide value and can fluctuate.
Table 11- 27 Power loss for molded case circuit breakers
Type
Rated current [A]
Power loss [W]
Path resistance [mΩ]
VL160X
100
13
0,43
160
34
0,44
VL160
100
16
0,53
160
40
0,52
VL250
250
60
0,32
VL400
400
90
0,19
VL630
630
160
0,13
VL800
800
250
0,13
VL1250
1250
210
0,045
VL1600
1600
260
0,034
11.6
Capacitor banks
Selection of the molded case circuit breaker for protecting and switching capacitors
This table takes account of only a few typical applications and combinations. The appropriate
selection must be made for all other applications.
Table 11- 28 Selection examples for capacitor protection circuits
Rated voltage
[50 Hz]
Q
c
capacitor bank
power [kvar]
Capacitor rated
current
x 1.5 = I
R
of the
SENTRON VL [A]
Upstream 3VL molded case circuit breaker
Type
I
R
[A]
I
i
[A]
230 V
15
56
VL160
50-63
600
30
113
VL160
100-125
1000
400 V
25
54
VL160
50-63
600
50
108
VL160
100-125
1000
100
216
VL250
200-250
2000
415 V
20
42
VL160
40-50
600
40
84
VL160
80-100
1000
525 V
25
42
VL160
40-50
600
50 84 VL160 80-100 1000